BC67 Colorful Light USB QC3.0 PD Fast Charging Voltage Detection Car Bluetooth MP3 FM Transmitter Phone Charger Wirelessly transmit calls and audio to the car FM stereo system via Bluetooth Easy to operate with the design of a large rotary button RGB LED backlight adds luster to your car Large orange dual LED display Detect the voltage of the car battery at startup U-Disk, USB QC3.0 and PD3.0 ports Compatible with all mobile phones, tablets, MP3 and other USB charging devices Specification: Rated working voltage: 12V-24V Interface: USB1: U Disk (1G-64G, Not Included) USB2: QC3.0 (maximum 15W) PD: PD3.0 (maximum 15W) Working temperature: 0~50? Support playback format: MP3/WMA/WAV/FLAC Signal to noise ratio: >60dB Battery voltage error: 0.5V Bluetooth version: version 5.0 Bluetooth sound processing: DSP and A2DP Bluetooth transmission distance: 10M Bluetooth microphone effective distance: 0.5~2M FM transmitting frequency: 87.5~108Mhz Package included: 1 x Car Bluetooth FM Transmitter 1 x English User Manual Other items not included